Meredith Whitney: Sell Citigroup

``I think it's an impossible feat,'' Whitney said. ``They don't have the revenue power, they don't have the earnings power in so many of their businesses. Even Stephen Hawking could not pull this off,'' she said, referring to the British physicist.

``I think it's an impossible feat,'' Whitney said. ``They don't have the revenue power, they don't have the earnings power in so many of their businesses. Even Stephen Hawking could not pull this off,'' she said, referring to the British physicist.